Exterior of the rear portion of a grooming mower deck



FIG. 1 is a top left rear perspective view of the exterior of the rear portion of a grooming mower deck embodying our design in accordance with the present invention, the broken lines indicating environmental structure not forming a part of our design;

FIG. 2 is a top plan view thereof, the broken lines indicating environmental structure not forming a part of our design;

FIG. 3 is a rear elevational view thereof, the broken lines indicating environmental structure not forming a part of our design;

FIG. 4 is a right side elevational view thereof, the broken lines indicating environmental structure not forming a part of our design; and,

FIG. 5 is a left side elevational view thereof, the broken lines indicating environmental structure not forming a part of our design. 

The ornamental design for the exterior of the rear portion of a grooming mower deck, as shown and described. 